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Based in Switzerland, ProtonMail is a secure email service using end-to-end encryption to protect emails and user data before they are sent to ProtonMail servers.

Up to a million ProtonMail users now benefit from the use of QuoVadis TLS/SSL certificates, incorporating Extended Validation (EV), 4096-bit RSA, SHA-256 hash, and Certificate Transparency (CT).

Andy Yen, founder and CEO of Proton Technologies, said "We are pleased to count QuoVadis as a trusted partner helping us provide the world’s most secure email service. After much evaluation, our team determined that QuoVadis is the best Swiss Certificate Authority (CA) for high security applications."

QuoVadis is the managed services company of WISeKey (WIHN listed on SIX Swiss Exchange). QuoVadis Trust/Link provides managed Public Key Infrastructure (PKI) including Digital Certificates for authentication, encryption, and digital signature; TLS/SSL Certificates for websites; and high-volume requirements such as IoT. QuoVadis sealsign provides software and cloud solutions for Electronic Signatures and time-stamping. QuoVadis is an EU and Swiss (ZertES) Qualified Trust Service Provider (TSP).